Structural Evolution of the Eastern Margin of Eurasia in Late Mesozoic and Cenozoic     

A.P.Sorokin  T.V.Artyomenko 《世界地质(英文版)》2003,6(2)

This paper features the structural evolution of the eastern margin of Eurasia in Late Mesozoic and Cenozoic.It is characterized by three stages of development: the riftogenic stage (Jurassic-Early Cretaceous), the platform stage (Late Cretaceous) and the neotectonic one (Paleogene-Quarternary). The boundaries between these stages are distinctly fixed by the geological time limits of planetary range. It is demonstrated that the riftogenic and neotectonic stages were characterized by a high degree of geodynamic activity, and the platform one by a decrease in contrast of tectonic movements. The main river net was formed in the Early Cretaceous and in the Neogene. It experienced a serious reconstruction accompanied by the formation of the Amur River valley being similar to the modem one.  相似文献   

First geochronological data on felsic lavas from the Ezop-Yamalin volcanoplutonic zone, Khingan-Okhotsk volcanogenic belt     

I. M. Derbeko  A. A. Sorokin  V. A. Ponomarchuk  A. V. Travin  A. P. Sorokin 《Doklady Earth Sciences》2008,419(2):231-234

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First geochronological data on felsic lavas from the Ezop-Yamalin volcanoplutonic zone,Khingan-Okhotsk volcanogenic belt     

I. M. Derbeko  A. A. Sorokin  V. A. Ponomarchuk  A. V. Travin  A. P. Sorokin 《Doklady Earth Sciences》2008,419(1):231-234

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Tectonic conditions of sedimentation and source areas of Upper Proterozoic and Lower Paleozoic terrigenous deposits of the Lesser Khingan Terrane of the Central Asian Fold Belt     

Yu. N. Smirnova  A. A. Sorokin  A. B. Kotov  V. P. Kovach 《Stratigraphy and Geological Correlation》2016,24(3):219-241

This work presents the results of geological, geochemical, and Sm-Nd isotopic and geochemical studies of Late Riphean–Cambrian terrigenous rocks of the Khingan Group of the Lesser Khingan Terrane of the Central Asian Fold Belt, as well as the results of U-Pb geochronological (LA-ICP-MS) studies of detrital zircons from these deposits. These deposits are the most ancient in the structure of the terrain. It was found that the deposits of Iginchi and underlying Murandavi formations are attributed to the Late Riphean–Vendian age interval, and the Kimkan sequence, to the Late Cambrian–Early Ordovician. The periods of formation of the Murandavi and Iginchi formations, on one hand, and the Kimkan sequence, on the other hand, are separated by the stage of granitoid magmatism at the turn of the Vendian–Cambrian. Because of this, they cannot be attributed to a unified sedimentary sequence. It is the most probable that the sedimentation of the Iginchi and Murandavi formations and the Kimkan sequence occurred under subduction conditions against the backdrop of magmatic activity.  相似文献   

Primary divisibility of the protolithosphere and current tectonic divisibility of lithospheric blocks: New reconstructions     

S. I. Sherman  A. P. Sorokin 《Doklady Earth Sciences》2016,470(2):1006-1009

The layer forming the Earth’s solid cover is considered to be a uniformly cooling mantle body of low viscosity involved in the convection process. Its cooling is accompanied by the formation of Rayleigh–Benard cells transformed into primary blocks. Their dimensions and dynamics in the subsequent evolution of the Earth’s lithosphere were repeatedly disturbed by superglobal geodynamic cycles involving changes in the area and dynamics of the blocks, some of which were partially absorbed by the mantle, while others were generated for the first time up to the current state. The variably ranked lithosphere blocks transformed into linear dimensions were arranged in a logical series of lithosphere destruction: from convection of the cooling Earth and initial block divisibility of the protolithosphere to its recent plate tectonics and intensive variably ranked fragmentation and fracturing of the plates under the conditions of solid body fragmentation. Convection in the mantle is a genetic endogenic source of the first protolithosphere divisibility. Megablock and subsequent lithosphere divisibility are consistent with the process of crushing of a solid body.  相似文献   

On the character of Black Sea level rise during the Holocene     

V. M. Sorokin  P. N. Kuprin 《Moscow University Geology Bulletin》2007,62(5):334-341

The character of changes in the mollusk fauna in the Late Pleistocene and Holocene sediments within the Bulgarian, Northwestern, Crimean, and Kerch segments of the Black Sea shelf has been examined. A bed containing fossil remains of brackish-water and marine mollusks was recognized in these sediments; the bed accumulated, based on results of radiocarbon datings, 500–1000 years ago. The obtained data do not support the existing notion of a catastrophic fill-up of the Black Sea Basin by marine Mediterranean water [19].  相似文献   

Early Paleozoic gabbro-granitoid associations in eastern segment of the Mongolian-Okhotsk foldbelt (Amur River basin): Age and tectonic position     

A. A. Sorokin  A. B. Kotov  E. B. Sal’nikova  N. M. Kudryashov  V. P. Kovach 《Stratigraphy and Geological Correlation》2007,15(3):241-257

Magmatic rocks of the Pikan and Un’ya massifs situated in eastern segment of the Mongolian-Okhotsk foldbelt are studied using isotopic-geochronological (U-Pb zircon dating) and geochemical methods. Two rock complexes different in age are recognized in the Pikan massif: the high-Al gabbro-tonalite association of the Middle Ordovician (468 ± Ma) and granodiorite-granite association of the Late Silurian-Early Devonian (415 ± 7 Ma). The Late Ordovician age (454 ± 5 Ma) is established for leucocratic granites of the Un’ya massif. As is suggested, the Pikan and Un’ya massifs are “allogenic blocks” detached from continental framework of the Mongolian-Okhotsk foldbelt and tectonically emplaced into the foldbelt structure at the last stage of its development.  相似文献   

The chemical composition and tectonic conditions of deposition of Paleozoic terrigenous sediments of the Ol’doi Terrain (eastern portion of the Central Asian Fold Belt)     

A. A. Sorokin  Yu. N. Smirnova  L. I. Popeko  A. P. Sorokin  Yu. V. Smirnov 《Doklady Earth Sciences》2010,435(1):1431-1434

This article contains the first data on the chemical composition and tectonic conditions of deposition of Paleozoic terrigenous sediments of the Ols’doi Terrain located in the eastern portion of the Central Asian Fold Belt. The data obtained suggest that at the initial stage deposition of sediments took place in the environment of a passive continental margin, while at the final stage it occurred in the environment of an island arc or an active continental margin. Based on all geological data available, the change of the geodynamic settings corresponds to the time of the formation of the Norovlya margin-continental magmatic arc.  相似文献   

First data on the age of Early Paleozoic granitoids from the Malyi Khingan terrane of the Central Asian fold belt     

A. A. Sorokin  A. B. Kotov  E. B. Sal’nikova  A. P. Sorokin  S. Z. Yakovleva  A. M. Fedoseenko  Yu. V. Plotkina 《Doklady Earth Sciences》2010,431(1):299-303

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Isotope geochemical (Sr,Nd)-peculiarities and sources of Mesozoic magmatic associations of the Umlekano-Ogodzhinskii belt (Amur Area)     

Sorokin  A. A.  Kovach  V. P.  Kotov  A. B.  Sorokin  A. P.  Ponomarchuk  V. A.  Zagornaya  N. Yu. 《Doklady Earth Sciences》2010,435(2):1650-1655

Doklady Earth Sciences -  相似文献